Extra player creation points
Create a player and use all available ability points. Save your player to a VMU, exit the game, and then start the game again. IN Player Edit mode, choose your player and add the extra ability points.
Automatic batting aim
On rookie difficulty setting, hold the Analog-stick slightly in any direction while batting and the batting cursor will automatically follow the ball.
While playing defense, just before the computer catches the ball, press A and the direction of the base you want to throw towards.
Hit a homerun with the home team in their stadium during a night game.
At Pacific Bell Park, hit three homeruns into McCovey Cove